linux-kernel - Re: [PATCH tip/core/rcu 2/2] documentation: Record reason for rcu

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Date:   Tue, 23 Aug 2016 16:30:47 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Paul McKenney <paulmck@...ux.vnet.ibm.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Eric Dumazet <edumazet@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>, jiangshanlai@...il.com,
        dipankar@...ibm.com, Andrew Morton <akpm@...ux-foundation.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Triplett <josh@...htriplett.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Howells <dhowells@...hat.com>,
        Darren Hart <dvhart@...ux.intel.com>,
        Frédéric Weisbecker <fweisbec@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        pranith kumar <bobby.prani@...il.com>,
        Greg Ungerer <gerg@...ux-m68k.org>
Subject: Re: [PATCH tip/core/rcu 2/2] documentation: Record reason for
 rcu_head two-byte alignment

On Tue, Aug 23, 2016 at 4:23 PM, Paul E. McKenney
<paulmck@...ux.vnet.ibm.com> wrote:
> commit 89d39c83d193733ed5fff1c480cd42c9de1da404
> Author: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> Date:   Tue Aug 23 06:51:47 2016 -0700
>
>     rcu: Tighted up __call_rcu() rcu_head alignment check
>
>     Commit 720abae3d68ae ("rcu: force alignment on struct
>     callback_head/rcu_head") forced the rcu_head (AKA callback_head)
>     structure's alignment to pointer size, that is, to 4-byte boundaries on
>     32-bit systems and to 8-byte boundaries on 64-bit systems.  This
>     commit therefore checks for this same alignment in __call_rcu(),
>     which used to check for two-byte alignment.
>
>     Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
>     Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
>     Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds